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<br />SEAL OF RE/NFORCED CONCRETE AT LEAST <br />/2 /NCNES TN/CK AND KEYED /2 /NCHES /NTO <br />COAL OR TO ROCK CONTACT. ' <br />RE/NFORCED MAT - //2 -/N. REBAR <br />/2 /N. O.C. EACH O/RECT/ON <br />w <br />w <br />sECriON <br />GENERAL SPEC/F/CAT/ONS <br />FOR <br />PERMANENT CLOSURE OF PORTAL ENTR/ES <br />T. COVER OVER PORTAL <br />RTN F/LL <br />SEAL PLACED I <br />WHERE THE 3 N <br />OVERBURDEN /S <br />AT LEAST ~3N <br />0.0.0 0. 0 ~ ~ . n o <br />O.'o. •o• <br />N <br />F/ <br />EL EVAT/ON <br />